Adjustable radial kerfing saw



Nov, 30, 1948.

A. sclAN 'A ADJUSTABLE RADIAL KERFING- SAW 3 Sheets-Sheet 1 Filed Sept. 2, 1944 INVENTOR.

g/5cm;

I A. sclAuNA 2,455,097

ADJUSTABLE RADIAL KERFING SAW Filed Sept. 2, 1944 3 Sheets-Sheet 2 INVENTOR.

Nov. 30,1948. A. SCIANNA' v2,455,097

ADJUSTABLE RADIAL KERFING SAW Filed Sept. 2, 1944 3 Sheets-Sheet 3 IN V EN TOR.

Patented Nov. 30, 1943 UNITED TATIES ATENT "OFFICE ADJUSTABLETt iiZiKERFIN G SAW v Q Q Anthony Scianna, Chicago, 'Ill., assignor to Clamp Nail Gompa'nm-Ghicago, -Ill., a corporation of Illinois Application'September 2, 1944,"Se1?ial No. 552'g4'70 1 Claim. 1

My invention relates to power tools, and is "particularly-concerned with sawing equipment for ment embodying myinvention;

Figure 315 a plan view thereof;

Figure 4 is a vertical sectional view taken on the plane of the line 4'4 of Figure 3 and looking in the direction indicated by the arrows;

Figure 5-'is an elevational view illustrating a modification; and

Figure 6 is a plan view of the arrangement illustrated in Figure 5.

Figure 1 illustrates, 'for example, a forty-five degree miter joining of two strips of wood a and b, the juxtaposed surfaces-being indicated at c. In each piece a and b, at the joint surface, a kerf d, normal to the surface c is sawed, and, when the'two pieces are put together as illustrated,

the alined kerfs d, d, are ready for thereception of the clamp nail e, which is of I cross-section,

comprising the web 1, adapted to enter the kerfs (Lad, and the flanges g, g, which are adapted to bite into the wood at the kerf bottoms; thus firmly to hold the two pieces a; and b together.

My invention is concerned with the sawing of the kerfs d, dywhich I accomplish as an immeiate adjunct to the sawing of the pieces to be joined to form the joined surfaces.

Referring now to Figures 2 and 3;

It will be seen that, firstly, I illustrate a moreor-less conventional circular saw, comprising the saw table I, mounted upon the leg-frame 8, and the motor-driven circular saw itself, 9, mounted in an adjustable framework Ill, which saw extends through the slot II in the table I.

This entire framework, carrying the motordriven saw, can be raised and lowered by turning the hand wheel I2, and is also hung upon trunnions, so that the saw 9 may be swung into any selected angular position, by means of the hand wheel l3, through the medium of the worm l 4 and gear 15. A clamp [6 looks the framework in adjusted position. On top of the table I there is .2 mounted thegauge "I 1, which is slida'ble ba'ckaand forth'andagainstwhich the stock is carried-as it l's passed into contact with the saw.

That which has thus been described is, asindicated, a more or less conventional and well known saw equipment-and it is thereforeinot shown in any greater detail.

"My invention, in itsffirst form, .in'volves'th'e mounting-of the kerfl-ng saw'as an attachment to the more-or-less standard table I, and I.'-shall now describe that i attachment :by' ref'erring to the-same figurea-and. alsloaadditional-Figure 4.

-c-'clamp-l8 is applieds-to the table has illustrated, being-heldintposition' by means of set screws I 9. This C-clamp isrprovided with the upwardly extending tool post-"20 which is embraced by the. supporting clamp 2|, held on the tool post 20, at any selected =vertical -positi'on, by means of the hand""clampf22,i22. {Thissupporting clamp'2l :is moved vertically by'means of the hand screw23, which"engages theC-clamp IB, as illustrated in Figure 4, i and it is clear that, after beingmoved to athe 'desired' vertical position by means of the hand screw 23, the supporting clamp may be lockediin-position"byrmeahs of the hand clamp 22.

supporting-barn is mounted crosswise in the supporting-clamp 2|, 1. e. in direction to -extend towardaltlie plane ofaction of the saw -9. A5 best-shown in Figure 4; this suppor-tinglbar 24 is mounted inva slotin'the clamp 2|; and it is provided, on its top, with: a rack 25, to be 'engaged by a pinion =26 mounted upon shaft 2! in-the bearing inembers28 and '29 'onthe top of the clamp," the shaft 21 be'ing provided'with the hand wheel '30. 'Asthe hand wheel 3ll is turned in one direction-or theothenthei supportin'g'bar 24 of -the hand clamp'iil.

At its. outer"efid,ithe' 'supporting bar 2 4 is provided with a supporting bracket 32 mounted for angular adjustment on the axis a: and held to the supporting bar, and in adjusted position, by the hand clamp 33. This supporting bracket 32 is of the split ring type, as indicated at 34, and it supports the kerf saw motor 35, and the kerf saw 3-6 mounted on the armature shaft thereof, the axis of this armature shaft intersecting the axis cc, as will be clear from Figure 2.

The means for supporting the kerf saw motor is offset rearwardly from the vertical plane of the axis of the main saw 9, and, as best shown in Figure 3, the arrangement is thus such that screw and nuts 5|.

kerf saw motor 35 and the kerf saw 36.

after the work is passed against the main saw 9, the same movement, continued, passes it into engagement with the kerf saw 36. Viewing this arrangement in elevation, as in Figure 2, it will be seen that the plane of the saw 36 is normal to the plane of the saw 9, it being usual to make the kerfs normal to the joined surfaces, as indicated in Figure 1. In Figure 2 the work, indicated at w, is being sawed for a forty-five degree miter joint, and, accordingly, the axis of the kerf saw shaft is set at forty-five degrees, As the artisan moves the work, on the saw table 7, from front to back, held in engagement with the gauge l7, it first encounters the main saw 9, whereby the miter cutis accomplished, and then, as the same movement is continued, the

kerf is sawed by the saw 36 which has previously can be adjusted to cutthe kerf just where it should be cut in the surface cut by, the saw 9.

In Figures 5 and 6 .I have illustrateda modification whereby the kerf saw 36 is always at right angles to the main saw,9, regardless of the selected positionof themain saw 9, without further attentionof the operator,

In these figures, thekerf saw and'its motor, instead of being mounted for angular adjustability on the saw table, is mounted without angular adjustability on theframework which carries the main saw 9. Thus, in whichever position the main saw 9 is disposed, the kerf saw 36 is always at right anglesto it. t

The saw table, the maincircular saw, the circular kerf saw, and the keri saw motor are supplied with the same reference characters with which these elements are "supplied in the other figures. Extending laterally, andthen upwardly, from the swinging framework inwhich the saw 9 is carried, is a bracket 37 which, inturn, carries a dovetail slide 38 beyond the rear edge of the saw table. A bracket 39 has a base 40 which is movable-in the dovetail slide 36, by Tmeansof a hand wheel 4|, through the intervention of a pinion 42 and rack 43. By turning the hand wheel 4| the bracket 39 may be moved back orforth to adjusted position, wherein it may beheld by means of the locking screwtand nuts 44. The upright portion fi of the bracket 39 is also in the form of a slide, in which thebase 46 of a forwardly extending bracket 41 is mounted and in which itmay be moved up or down by means of the hand wheel 48, through theintervention of pinion 49 and rack 50, this bracket being held in any adjusted position by means of the locking The bracket 41,;carries the It will be seen that by means of the hand wheel 4! the kerf saw 36 may be moved toward and away from the plane of the saw 9, and that, by means of the hand wheel 48, it may be moved toward and away from the axis of the saw 9. Whatever these adjusted positions, as already indicated, the saw 36 is always at right angles to the saw 9. The use of the machine is precisely the same as that described in reference to the equipment shown in Figures 2, 3 and 4.

It is also possible to mount the circular kerf saw from below the saw table by slotting the latter, in which case the kerf saw motor can be located below the saw table and indeed one motor used to operate both saws.

I claim:

An accessory for a circular saw machine, comprising a clamp for securing to the saw table, a vertical tool post on said clamp, a supporting clamp mounted on said tool post and vertically adjustable thereon, a hand screw threaded in said supporting clamp and engaging said firstnamed clamp for raising and lowering said supporting clamp on said tool post, a hand clamp forlocking said supporting clamp in adjusted position on said tool post, said supporting clamp having a transverse opening therein, a supporting bar mounted in said opening, rack and pinion mechanism for moving said supporting bar to adjusted position in said supporting clamp, a hand clamp for locking said supporting bar in fixed position in said supporting clamp, a supporting member at the free end of said supporting bar, said supporting member being mounted on said supporting bar on an axisfor angular adjustment, means for locking said supporting member in adjusted position on said supporting bar, an electric motor mounted in said supporting member, and a circular saw mounted on the armature shaft of said electric motor.

ANTHONY SCIANNA.

' REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 160,838 Norton Mar. 16,1875 722,197 Schneider Mar. 3, 1903 1,828,043 Hedgpeth Oct. 20, 1931 1,839,378 Dannehower Jan. 5, 1932 1,846,641 Hedgpeth Feb. 23, 1932 1,850,773 Rue ger Mar. 22, 1932 2,265,407 Tautz Dec. 9, 1941 2,347,374 Stahler Apr. 25, 1944 v FOREIGN PATENTS Number Country Date Great Britain Dec. 9, 1887 

